<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 警告 -->
      <el-alert title="注意 :  只允许为第三级分类设置相关参数!" type="warning" show-icon
        :closable='false'>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类 :</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader expand-trigger='hover' v-model="selectedCateKeys"
            :options="catelist" :props="cateProps" @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tabs 标签列 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick ">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type='primary' size='mini' :disabled='isBtnDisabled'
            @click="addDialogVisible=true">添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table :data='manyTableData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag :key='i' v-for='(item,i) in scope.row.attr_vals'
                  closable @close='handleClose(i,scope.row)'>
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small"
                  @click="showInput(scope.row)">
                  + New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type='index'></el-table-column>
            <el-table-column label="参数名称" prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope="scope">
                <el-button sizi='mini' type='primary' icon='el-icon-edit'
                  @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button sizi='mini' type='danger' icon='el-icon-delete'
                  @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>

            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性的按钮 -->
          <el-button type='primary' size='mini' :disabled='isBtnDisabled'
            @click="addDialogVisible=true">添加属性
          </el-button>
          <!-- 静态参数表格 -->
          <el-table :data='onlyTableData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag :key='i' v-for='(item,i) in scope.row.attr_vals'
                  closable @close='handleClose(i,scope.row)'>
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small"
                  @click="showInput(scope.row)">
                  + New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type='index'></el-table-column>
            <el-table-column label="参数名称" prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope="scope">
                <el-button sizi='mini' type='primary' icon='el-icon-edit'
                  @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button sizi='mini' type='danger' icon='el-icon-delete'
                  @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible"
      @close='addFormClose' width="50%">
      <el-form ref="addFormRef" :model="addForm" :rules='addFormRules'
        label-width="100px">
        <el-form-item :label="titleText" prop='attr_name'>
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定
        </el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog title="修改" :visible.sync="editDialogVisible" width="30%"
      @close='editFormClose'>
      <!-- 修改参数的表单 -->
      <el-form ref="editFormRef" :model="editForm" :rules='editFormRules'
        label-width="100px">
        <el-form-item :label="titleText" prop='attr_name'>
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定
        </el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 被激活的页签的名字
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 添加参数的对话框的隐藏显示
      addDialogVisible: false,
      // 控制tab 文本框的隐藏与显示
      inputVisible: false,
      // tag文本框中输入的内容
      inputValue: '',
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加参数表单的数据验证规则
      addFormRules: {
        attr_name: [
          {
            required: true, message: '请输入参数名称', trigger: 'blur'
          }
        ]
      },
      // 修改参数的对话框
      editDialogVisible: false,
      // 修改表单的数据对象
      editForm: {},
      editFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const res = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品列表失败')
      this.catelist = res.data
    },
    // 级联选择框中的项发生变化 会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // 根据所选分类的id 和当前所处的面板 获取对应的参数
      const res = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数失败')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      // 将获取到的数据挂载到不同的数据原上
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 切换静态动态
    handleTabClick () {
      this.getParamsData()
      console.log(this.activeName)
    },
    addParams () {
      this.$refs.addFormRef.validate(async v => {
        console.log(v)
        if (!v) return
        const res = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 关闭添加属性框 重置表单
    addFormClose () {
      this.$refs.addFormRef.resetFields()
    },
    // 修改参数对话框
    async showEditDialog (attrId) {
      const res = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) return this.$message.error('获取参数失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 修改参数
    editParams () {
      this.$refs.editFormRef.validate(async v => {
        if (!v) return
        const res = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.editForm.attr_sel })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.getParamsData()
        this.$message.success('修改参数成功')
        this.editDialogVisible = false
      })
    },
    // 修改参数框的关闭重置
    editFormClose () {
      this.$refs.editFormRef.resetFields()
    },
    // 删除参数
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
      if (confirmResult === 'confirm') {
        // 实行删除逻辑
        const res = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
        if (res.meta.status !== 200) return this.$message.error('删除参数失败')
        this.$message.success('删除参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      }
    },
    showInput (row) {
      // 让文本框自动获取焦点
      // $nextTick 方法的引用 就是当页面重新渲染的时候
      // 才会指定回调函数中的代码
      row.inputVisible = true
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 文本框失去焦点或按下了enter键 都会触发
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return出去 证明有内容 需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = 'false'
      this.saveAttrVals(row)
    },
    // 将对attr_vals操作保存到数据库
    async saveAttrVals (row) {
      // 发起请求保存这次操作
      const res = await this.$http.put(`categories/${this.cateId}/attributes/${row.attrId}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        })
      if (res.meta.status !== 200) return this.$message.error('添加属性失败')
      this.$message.success('修改属性成功')
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }

  },
  computed: {
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中三级分类的id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
 <style lang='less' scoped>
.cat_opt {
  margin: 15px 0;
}
.el-card {
  margin: 20px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 180px;
}
</style>
